kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 1 PID: 20897 Comm: syz-executor.2 Not tainted 4.14.146 #0
kobject: 'loop3' (ffff8880a4ac7320): kobject_uevent_env
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff88808fb1e000 task.stack: ffff8880a9c78000
RIP: 0010:__read_once_size include/linux/compiler.h:183 [inline]
RIP: 0010:atomic_read arch/x86/include/asm/atomic.h:27 [inline]
RIP: 0010:refcount_sub_and_test+0x2b/0xf0 lib/refcount.c:179
RSP: 0018:ffff8880a9c7fb98 EFLAGS: 00010202
kobject: 'loop3' (ffff8880a4ac7320): fill_kobj_path: path = '/devices/virtual/block/loop3'
RAX: dffffc0000000000 RBX: ffff88808f647000 RCX: ffffffff84263c10
RDX: 0000000000000004 RSI: 0000000000000020 RDI: 0000000000000001
RBP: ffff8880a9c7fbc0 R08: 00000000f0a5e5e7 R09: ffff88808fb1e8c8
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000020
R13: 0000000000000001 R14: ffff88808f647014 R15: 0000000000000000
FS:  0000555556b98940(0000) GS:ffff8880aef00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2cb24000 CR3: 00000000894df000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
kobject: 'loop5' (ffff8880a4b58b60): kobject_uevent_env
Call Trace:
 refcount_dec_and_test+0x1b/0x20 lib/refcount.c:212
 vb2_vmalloc_put+0x18/0x70 drivers/media/v4l2-core/videobuf2-vmalloc.c:68
kobject: 'loop5' (ffff8880a4b58b60): fill_kobj_path: path = '/devices/virtual/block/loop5'
 __vb2_buf_mem_free+0x103/0x1e0 drivers/media/v4l2-core/videobuf2-core.c:240
 __vb2_free_mem drivers/media/v4l2-core/videobuf2-core.c:409 [inline]
 __vb2_queue_free+0x634/0x7d0 drivers/media/v4l2-core/videobuf2-core.c:454
 vb2_core_queue_release+0x64/0x80 drivers/media/v4l2-core/videobuf2-core.c:2043
kobject: 'loop3' (ffff8880a4ac7320): kobject_uevent_env
 vb2_queue_release drivers/media/v4l2-core/videobuf2-v4l2.c:669 [inline]
 _vb2_fop_release+0x1cf/0x2a0 drivers/media/v4l2-core/videobuf2-v4l2.c:840
 vb2_fop_release+0x75/0xc0 drivers/media/v4l2-core/videobuf2-v4l2.c:854
kobject: 'loop3' (ffff8880a4ac7320): fill_kobj_path: path = '/devices/virtual/block/loop3'
 vivid_fop_release+0x180/0x3f0 drivers/media/platform/vivid/vivid-core.c:486
 v4l2_release+0xf9/0x190 drivers/media/v4l2-core/v4l2-dev.c:446
 __fput+0x275/0x7a0 fs/file_table.c:210
 ____fput+0x16/0x20 fs/file_table.c:244
kobject: 'loop3' (ffff8880a4ac7320): kobject_uevent_env
 task_work_run+0x114/0x190 kernel/task_work.c:113
kobject: 'loop3' (ffff8880a4ac7320): fill_kobj_path: path = '/devices/virtual/block/loop3'
 tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop+0x1da/0x220 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
 do_syscall_64+0x4bc/0x640 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x413711
kobject: 'loop3' (ffff8880a4ac7320): kobject_uevent_env
RSP: 002b:00007ffe5cb6fad0 EFLAGS: 00000293
kobject: 'loop3' (ffff8880a4ac7320): fill_kobj_path: path = '/devices/virtual/block/loop3'
 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000006 RCX: 0000000000413711
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 0000000000000001 R08: 000000006e783fbb R09: 000000006e783fbf
R10: 00007ffe5cb6fbb0 R11: 0000000000000293 R12: 000000000075bf20
R13: 00000000000663ec R14: 00000000007613e8 R15: 000000000075bf2c
Code: 
kobject: 'loop5' (ffff8880a4b58b60): kobject_uevent_env
55 48 89 e5 41 56 41 55 41 89 
kobject: 'loop5' (ffff8880a4b58b60): fill_kobj_path: path = '/devices/virtual/block/loop5'
fd 41 54 49 89 f4 53 48 83 ec 08 e8 76 5b 85 fe 4c 89 e2 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 14 02 4c 89 e0 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 
RIP: __read_once_size include/linux/compiler.h:183 [inline] RSP: ffff8880a9c7fb98
RIP: atomic_read arch/x86/include/asm/atomic.h:27 [inline] RSP: ffff8880a9c7fb98
RIP: refcount_sub_and_test+0x2b/0xf0 lib/refcount.c:179 RSP: ffff8880a9c7fb98
kobject: 'loop0' (ffff8880627dc620): kobject_uevent_env
---[ end trace 319686774105760b ]---
kobject: 'loop0' (ffff8880627dc620): fill_kobj_path: path = '/devices/virtual/block/loop0'